Soldering flux



Patented Apr. 14, 1942 ulylnzni STAT 7 soLnEarNG FLux Leo Liberthson, New York, N. Y., assignor, to L.

, Sonneborn Sons, Inc., a corporation ofDelaware V This invention relates to new "and useful improvement in soldering fluxes. f

The function of. a-solderingfluxis primarily that of conditioning the surfaces to be soldered and does not 'as such become -a part of the 'flnished joint. The conditioning step, however, is

of great importance as without properconditioning deficiencies in the metallic loint result. A

solder flux should, furthermore, not leave any 1'. 1'

corrosive residue or decomposition products as NoDrawing. Application masts-31.11940,

Serial 110.137.2396 ,5

7 Claims. (or; 14925) a ;flned, which, dueto its particular well-known -gstructura'composition and characteristics, 'is' fparticularlywadapted to contribute to the em .ciency of the ultimate flux composition. Among the flux typeg-inorganic' salts I prefer to use a eutectic mixture of zinc chlorideand ammoni- .um chloride. The petroleum mahogany sulphanate compound to be used in the compounding .of my'new soldering flux} may be either a free petroleum mahogany sulphonic acid or any al- {kali salt thereoflbutpreferably the former. The petroleum mahogany sulphcnate acids or salts {constitute thewell-Qknown products derived from the acid, treatment of a petroleum lubricating oil distillate under sulphonating conditions.

In accordance with the invention the soldering ."flux contains the various components in subthe result of solderingtemperatures capable,of

injuring the Joint, should be inert with. respect the skin of the worker applying the same. Fi-

nally, a soldering fluxshould be preferably odorless and should not contain any volatilizable matter that might give rise to the formation of ob-' jectionable or injurious fumes.

A variety ofsoldering fluxes are being used, both of the inorganic as well as of the organic type. There is, however, no flux presently availv 31 able which possesses characteristics 5 satisfying all the afore-enumerated requirements so that the conventionally available fluxes necessitate the making of compromises, depending upon the" requirements to be met. The most widely used stantially the following proportions:

"uni mahogany sulphonic acid. 7

"The remainders; concentrated aqueous solution of an inorganic saltjof the solder flux type and preferablyofa eutectic mixture of zinc chlo-,

F ride and ammonium chloride.

'- The foregoing components of the flux composition in accordance with the invention are pref-.

erably compounded by first melting together the mahogany sulphonate and the petrolatum until inorganic fluxes are those comprising inorganic V salts, such as zinc chloride, ammonium chloride, magnesium chloride, aluminum chloride, oreutectic mixtures of any two or more of these.

Such salts will be hereinafter. referred togenerically as inorganic salts of the solder flux type and when using this expression in the specification and claims, I'mean thereby. any one or eutectic mixture of inorganic'salts commonly used as solder fluxes.

I have discovered a new and improved soldering flux substantially meeting all of the requirements for soldering fluxes hereinbefore enumerated and essentially comprising a stabledispersion of inorganic salts of the solder-flux type in carbon vehicle, a petrolatum, either crude or remaintaining the temperature sufficiently high to assure fluidity of the mass. Upon cooling, the resulting product constitutes a substantially solid substance of a consistency comparable to that of the'pe'trolatum originally used.

Thefore'going description is by way of lllu stration and not of v limitation and I am not to be limited to any details but only by the appended claims in which I have endeavored to claim broadly all inherent novelty.-

I claim: 7 1. A soldering flux essentially comprising a substantially stable dispersion of at least one inorganic salt of the solder-flux type in a hydrocarbon vehicle substantially solid at normal temperatures and containing at least one member of the group consisting of petroleum mahog- 2 f 12.27am r any sulphonic acid and alkali petroleum nahossmsulphonate; a

2; A soldering flux in accordance with cum 1 in vwhich said hydrocarbon vehicle potrolatum; i snd in which said dispersion is s dispersion of on aqueous solution "oi said inorganic salt.

a. A soideringiiiuxcomprisinzsubstsntidllyAO to 60% etm1amm. subsuntisny*5 toiimjeu -k ieum of at least one member selected iromtho mun conzistins of, petroleum mshocsny, Bill-510' phonic ncidiand slkslilpotroleuni'msl osany $11? phonste, and substsntisllx an to sm-orsmb-l "stsnt'islirconcentiited Mucous solllflq vflfstj w I ,tisllyazooncentrsted squeou's solution-,0! st least one inorganic salt otthe'soider flux type to therei last one inorganic an oiftiioasolder-iliisi mo;

V tnsoiderinziflux substantially 40 -15 to 80%petrolstumgsubstflitis1lxi to llm pe tx o; I t leum oi st least-one member, the group; consisting of petroleum mahogany Tsul-I- phonic 'scid and alkali petroleum mahogany phonat'ogsnd substantially vto 5 5% of a sub- 20 stantially. concentrated oque'ous solution of I "a eutectic mixtuxofoizinc' chloiid and. monifimfl chloride. 7 M w n P prmi ib i i 50% petrolstum, 'substsntislly 10% 'petroloum mshozsny aflphonicsci ind substantially 40% ot's siibatsntially aqueous solution ot's euteotio mix'ture'ot sine chloride-and smmoniu'm chioxideg-i 8." Method of 'prensrins s soldering flux comprising incorporatina momma: son 00 pa'r'ts'jbtpe'troi's'tiiin, substsntislly 5 to 10 parts ot stJesstonc. mombex. on! noup aconsistinz of petroleum nisl os sny sulphonlo sold and mm petroleum mummy mohonatqwun iiits'tionsnd under; conditions sssurin: fluidity .of sold potroistum, Soto m oi's'substsninor'gi nic shlfi infjsaid petrolstum.

7 Method in sccordmce with claimo in which sald oonditions moan; fluidity or said petro-a iatum compxise 'substsntiaily maintaininsa tem- 

